random.tcc (gamma_distribution<>::operator() (_UniformRandomNumberGenerator&, const param_type&): Redo, using the Marsaglia/Tsang algorithm.

2009-06-08  Paolo Carlini  <paolo.carlini@oracle.com>

	* include/bits/random.tcc (gamma_distribution<>::operator()
	(_UniformRandomNumberGenerator&, const param_type&): Redo, using
	the Marsaglia/Tsang algorithm.
	(gamma_distribution<>::param_type::_M_initialize): Adjust.
	(operator<<(basic_ostream<>&, gamma_distribution<>),
	operator>>(basic_ostream<>&, gamma_distribution<>): Likewise.

	* include/bits/random.tcc(student_t_distribution<>::_M_gaussian):
	Remove, just use normal_distribution.
	(operator<<(basic_ostream<>&, student_t_distribution<>),
	operator>>(basic_ostream<>&, student_t_distribution<>): Adjust.
	(linear_congruential_engine<>::operator()()): Move inline.
	(lognormal_distribution<>::operator()(_UniformRandomNumberGenerator&,
	const param_type&)): Move inline, just use normal_distribution.
	(operator<<(basic_ostream<>&, lognormal_distribution<>),
	operator>>(basic_ostream<>&, lognormal_distribution<>): Adjust.
	(weibull_distribution<>::operator()(_UniformRandomNumberGenerator&,
	const param_type&)): Move here, out of line.
	(piecewise_constant_distribution<>::param_type::param_type()): Move
	inline.
	* include/bits/random.h: Adjust, minor tweaks.

From-SVN: r148276